Class: Ably::Models::IdiomaticRubyWrapper

Inherits:
Object
  • Object
show all
Includes:
Ably::Modules::Conversions, Ably::Modules::MessagePack, Enumerable
Defined in:
lib/ably/models/idiomatic_ruby_wrapper.rb

Overview

Wraps Hash objects returned by Ably service to appear as Idiomatic Ruby Hashes with symbol keys It recursively wraps containing Hashes, but will stop wrapping at arrays, any other non Hash object, or any key matching the `:stops_at` options It also provides methods matching the symbolic keys for convenience

Examples:

ruby_hash = IdiomaticRubyWrapper.new({ 'keyValue' => 'true' })
# or recommended to avoid wrapping wrapped objects
ruby_hash = IdiomaticRubyWrapper({ 'keyValue' => 'true' })

ruby_hash[:key_value] # => 'true'
ruby_hash.key_value # => 'true'
ruby_hash[:key_value] = 'new_value'
ruby_hash.key_value # => 'new_value'

ruby_hash[:none] # => nil
ruby_hash.none # => nil

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Ably::Modules::MessagePack

#to_msgpack

Constructor Details

#initialize(mixedCaseHashObject, options = {}) ⇒ IdiomaticRubyWrapper

Creates an IdiomaticRubyWrapper around the mixed case Hash object


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 53

def initialize(mixedCaseHashObject, options = {})
  stop_at = options.fetch(:stop_at, [])

  if mixedCaseHashObject.kind_of?(IdiomaticRubyWrapper)
    $stderr.puts "<IdiomaticRubyWrapper#initialize> WARNING: Wrapping a IdiomaticRubyWrapper with another IdiomaticRubyWrapper"
  end

  @attributes = mixedCaseHashObject
  @stop_at = Array(stop_at).each_with_object({}) do |key, object|
    object[convert_to_snake_case_symbol(key)] = true
  end.freeze
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_sym, *arguments) ⇒ Object


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 128

def method_missing(method_sym, *arguments)
  key = method_sym.to_s.gsub(%r{=$}, '')
  return super if !has_key?(key)

  if method_sym.to_s.match(%r{=$})
    raise ArgumentError, "Cannot set #{method_sym} with more than one argument" unless arguments.length == 1
    self[key] = arguments.first
  else
    raise ArgumentError, "Cannot pass an argument to #{method_sym} when retrieving its value" unless arguments.empty?
    self[method_sym]
  end
end

Instance Attribute Details

#hashInteger (readonly)

Returns Compute a hash-code for this hash. Two hashes with the same content will have the same hash code

Returns:

  • (Integer)

    Compute a hash-code for this hash. Two hashes with the same content will have the same hash code


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 199

def hash
  attributes.hash
end

#HashHash (readonly)

Returns Access to the raw Hash object provided to the constructer of this wrapper

Returns:

  • (Hash)

    Access to the raw Hash object provided to the constructer of this wrapper


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 143

def attributes
  @attributes
end

#stop_atArray<Symbol,String> (readonly)

Returns array of keys that this wrapper should stop wrapping at to preserve the underlying Hash as is

Returns:

  • (Array<Symbol,String>)

    array of keys that this wrapper should stop wrapping at to preserve the underlying Hash as is


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 41

class IdiomaticRubyWrapper
  include Enumerable
  include Ably::Modules::Conversions
  include Ably::Modules::MessagePack

  attr_reader :stop_at

  # Creates an IdiomaticRubyWrapper around the mixed case Hash object
  #
  # @attribute [Hash] mixedCaseHashObject mixed case Hash object
  # @attribute [Array<Symbol,String>] stop_at array of keys that this wrapper should stop wrapping at to preserve the underlying Hash as is
  #
  def initialize(mixedCaseHashObject, options = {})
    stop_at = options.fetch(:stop_at, [])

    if mixedCaseHashObject.kind_of?(IdiomaticRubyWrapper)
      $stderr.puts "<IdiomaticRubyWrapper#initialize> WARNING: Wrapping a IdiomaticRubyWrapper with another IdiomaticRubyWrapper"
    end

    @attributes = mixedCaseHashObject
    @stop_at = Array(stop_at).each_with_object({}) do |key, object|
      object[convert_to_snake_case_symbol(key)] = true
    end.freeze
  end

  def [](key)
    value = attributes[source_key_for(key)]
    if stop_at?(key) || !value.kind_of?(Hash)
      value
    else
      IdiomaticRubyWrapper.new(value, stop_at: stop_at)
    end
  end

  def []=(key, value)
    attributes[source_key_for(key)] = value
  end

  def fetch(key, default = nil)
    if has_key?(key)
      self[key]
    else
      if default
        default
      elsif block_given?
        yield key
      else
        raise KeyError, "key not found: #{key}"
      end
    end
  end

  def size
    attributes.size
  end

  def keys
    map { |key, value| key }
  end

  def values
    map { |key, value| value }
  end

  def has_key?(key)
    attributes.has_key?(source_key_for(key))
  end

  # Method ensuring this {IdiomaticRubyWrapper} is {http://ruby-doc.org/core-2.1.3/Enumerable.html Enumerable}
  def each
    return to_enum(:each) unless block_given?

    attributes.each do |key, value|
      key = convert_to_snake_case_symbol(key)
      value = self[key]
      yield key, value
    end
  end

  # Compare object based on Hash equivalent
  def ==(other)
    return false unless other.kind_of?(self.class) || other.kind_of?(Hash)

    other = other.to_hash if other.kind_of?(self.class)
    to_hash == other
  end

  def method_missing(method_sym, *arguments)
    key = method_sym.to_s.gsub(%r{=$}, '')
    return super if !has_key?(key)

    if method_sym.to_s.match(%r{=$})
      raise ArgumentError, "Cannot set #{method_sym} with more than one argument" unless arguments.length == 1
      self[key] = arguments.first
    else
      raise ArgumentError, "Cannot pass an argument to #{method_sym} when retrieving its value" unless arguments.empty?
      self[method_sym]
    end
  end

  # @!attribute [r] Hash
  # @return [Hash] Access to the raw Hash object provided to the constructer of this wrapper
  def attributes
    @attributes
  end

  # Takes the underlying Hash object and returns it in as a JSON ready Hash object using camelCase for compability with the Ably service.
  # Note name clashes are ignored and will result in loss of one or more values
  # @example
  #   wrapper = IdiomaticRubyWrapper({ 'mixedCase': true, mixed_case: false, 'snake_case': 1 })
  #   wrapper.as_json => { 'mixedCase': true, 'snakeCase': 1 }
  def as_json(*args)
    attributes.each_with_object({}) do |key_val, new_hash|
      key                      = key_val[0]
      mixed_case_key           = convert_to_mixed_case(key)
      wrapped_val              = self[key]
      wrapped_val              = wrapped_val.as_json(args) if wrapped_val.kind_of?(IdiomaticRubyWrapper)

      new_hash[mixed_case_key] = wrapped_val
    end
  end

  # Converts the current wrapped mixedCase object to JSON
  # using snakedCase syntax as expected by the Realtime API
  def to_json(*args)
    as_json(args).to_json
  end

  # Generate a symbolized Hash object representing the underlying Hash in a Ruby friendly format.
  # Note name clashes are ignored and will result in loss of one or more values
  # @example
  #   wrapper = IdiomaticRubyWrapper({ 'mixedCase': true, mixed_case: false, 'snake_case': 1 })
  #   wrapper.to_hash => { mixed_case: true, snake_case: 1 }
  def to_hash(*args)
    each_with_object({}) do |key_val, object|
      key, val    = key_val
      val         = val.to_hash(args) if val.kind_of?(IdiomaticRubyWrapper)
      object[key] = val
    end
  end

  # Method to create a duplicate of the underlying Hash object
  # Useful when underlying Hash is frozen
  def dup
    Ably::Models::IdiomaticRubyWrapper.new(attributes.dup, stop_at: stop_at.keys)
  end

  # Freeze the underlying data
  def freeze
    attributes.freeze
  end

  def to_s
    attributes.to_s
  end

  # @!attribute [r] hash
  # @return [Integer] Compute a hash-code for this hash. Two hashes with the same content will have the same hash code
  def hash
    attributes.hash
  end

  private
  def stop_at?(key)
    @stop_at.has_key?(key)
  end

  # We assume by default all keys are interchangeable between :this_format and 'thisFormat'
  # However, this method will find other fallback formats such as CamelCase or :symbols if a matching
  # key is not found in mixedCase.
  def source_key_for(symbolized_key)
    format_preferences = [
      lambda { |key_sym| convert_to_mixed_case(key_sym) },
      lambda { |key_sym| key_sym.to_sym },
      lambda { |key_sym| key_sym.to_s },
      lambda { |key_sym| convert_to_mixed_case(key_sym).to_sym },
      lambda { |key_sym| convert_to_lower_case(key_sym) },
      lambda { |key_sym| convert_to_lower_case(key_sym).to_sym },
      lambda { |key_sym| convert_to_mixed_case(key_sym, force_camel: true) },
      lambda { |key_sym| convert_to_mixed_case(key_sym, force_camel: true).to_sym }
    ]

    preferred_format = format_preferences.detect do |format|
      attributes.has_key?(format.call(symbolized_key))
    end || format_preferences.first

    preferred_format.call(symbolized_key)
  end
end

#stop_at array of keys that this wrapper should stop wrapping at to preserve the underlying Hash as is(arrayofkeysthatthiswrappershouldstopwrappingattopreservetheunderlyingHashasis) ⇒ Object (readonly)

Creates an IdiomaticRubyWrapper around the mixed case Hash object


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 53

def initialize(mixedCaseHashObject, options = {})
  stop_at = options.fetch(:stop_at, [])

  if mixedCaseHashObject.kind_of?(IdiomaticRubyWrapper)
    $stderr.puts "<IdiomaticRubyWrapper#initialize> WARNING: Wrapping a IdiomaticRubyWrapper with another IdiomaticRubyWrapper"
  end

  @attributes = mixedCaseHashObject
  @stop_at = Array(stop_at).each_with_object({}) do |key, object|
    object[convert_to_snake_case_symbol(key)] = true
  end.freeze
end

Instance Method Details

#==(other) ⇒ Object

Compare object based on Hash equivalent


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 121

def ==(other)
  return false unless other.kind_of?(self.class) || other.kind_of?(Hash)

  other = other.to_hash if other.kind_of?(self.class)
  to_hash == other
end

#[](key) ⇒ Object


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 66

def [](key)
  value = attributes[source_key_for(key)]
  if stop_at?(key) || !value.kind_of?(Hash)
    value
  else
    IdiomaticRubyWrapper.new(value, stop_at: stop_at)
  end
end

#[]=(key, value) ⇒ Object


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 75

def []=(key, value)
  attributes[source_key_for(key)] = value
end

#as_json(*args) ⇒ Object

Takes the underlying Hash object and returns it in as a JSON ready Hash object using camelCase for compability with the Ably service. Note name clashes are ignored and will result in loss of one or more values

Examples:

wrapper = IdiomaticRubyWrapper({ 'mixedCase': true, mixed_case: false, 'snake_case': 1 })
wrapper.as_json => { 'mixedCase': true, 'snakeCase': 1 }

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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 152

def as_json(*args)
  attributes.each_with_object({}) do |key_val, new_hash|
    key                      = key_val[0]
    mixed_case_key           = convert_to_mixed_case(key)
    wrapped_val              = self[key]
    wrapped_val              = wrapped_val.as_json(args) if wrapped_val.kind_of?(IdiomaticRubyWrapper)

    new_hash[mixed_case_key] = wrapped_val
  end
end

#attributesHash

Returns Access to the raw Hash object provided to the constructer of this wrapper

Returns:

  • (Hash)

    Access to the raw Hash object provided to the constructer of this wrapper


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 143

def attributes
  @attributes
end

#dupObject

Method to create a duplicate of the underlying Hash object Useful when underlying Hash is frozen


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 184

def dup
  Ably::Models::IdiomaticRubyWrapper.new(attributes.dup, stop_at: stop_at.keys)
end

#eachObject

Method ensuring this Ably::Modules::Conversions#IdiomaticRubyWrapper is Enumerable


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 110

def each
  return to_enum(:each) unless block_given?

  attributes.each do |key, value|
    key = convert_to_snake_case_symbol(key)
    value = self[key]
    yield key, value
  end
end

#fetch(key, default = nil) ⇒ Object


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 79

def fetch(key, default = nil)
  if has_key?(key)
    self[key]
  else
    if default
      default
    elsif block_given?
      yield key
    else
      raise KeyError, "key not found: #{key}"
    end
  end
end

#freezeObject

Freeze the underlying data


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 189

def freeze
  attributes.freeze
end

#has_key?(key) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 105

def has_key?(key)
  attributes.has_key?(source_key_for(key))
end

#keysObject


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 97

def keys
  map { |key, value| key }
end

#mixedCaseHashObject mixed case Hash object=(mixed) ⇒ Object

Creates an IdiomaticRubyWrapper around the mixed case Hash object


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 53

def initialize(mixedCaseHashObject, options = {})
  stop_at = options.fetch(:stop_at, [])

  if mixedCaseHashObject.kind_of?(IdiomaticRubyWrapper)
    $stderr.puts "<IdiomaticRubyWrapper#initialize> WARNING: Wrapping a IdiomaticRubyWrapper with another IdiomaticRubyWrapper"
  end

  @attributes = mixedCaseHashObject
  @stop_at = Array(stop_at).each_with_object({}) do |key, object|
    object[convert_to_snake_case_symbol(key)] = true
  end.freeze
end

#sizeObject


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 93

def size
  attributes.size
end

#to_hash(*args) ⇒ Object

Generate a symbolized Hash object representing the underlying Hash in a Ruby friendly format. Note name clashes are ignored and will result in loss of one or more values

Examples:

wrapper = IdiomaticRubyWrapper({ 'mixedCase': true, mixed_case: false, 'snake_case': 1 })
wrapper.to_hash => { mixed_case: true, snake_case: 1 }

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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 174

def to_hash(*args)
  each_with_object({}) do |key_val, object|
    key, val    = key_val
    val         = val.to_hash(args) if val.kind_of?(IdiomaticRubyWrapper)
    object[key] = val
  end
end

#to_json(*args) ⇒ Object

Converts the current wrapped mixedCase object to JSON using snakedCase syntax as expected by the Realtime API


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 165

def to_json(*args)
  as_json(args).to_json
end

#to_sObject


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 193

def to_s
  attributes.to_s
end

#valuesObject


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# File 'lib/ably/models/idiomatic_ruby_wrapper.rb', line 101

def values
  map { |key, value| value }
end